Strong foundation with 15 well-named tools, clear descriptions (avg 120 chars), and complete input schemas with type definitions. All tools follow verb_noun naming (turn_on, get_entity_state, list_entities). Descriptions are action-oriented and explain WHAT and WHEN. However, output schemas are not documented in the visible code, responses are inferred from implementation. Parameter descriptions are present but some lack constraint details (e.g., entity_id format, time range limits). Error handling is present (validation, policy denial, circuit breaker) but recovery guidance is minimal. Security is strong (audit logging, policy evaluation, state capture) but not reflected in tool descriptions.

• Document output schemas for all tools. Add a 'Returns' section to each description specifying field names, types, and meaning. E.g., 'Returns: {success: boolean, message: string, entity_id: string, state: string, attributes: object}'.
• Add constraint details to parameter descriptions. E.g., entity_id: 'Home Assistant entity ID in format domain.name (e.g., light.living_room, sensor.temperature)'. For set_value, specify numeric range or units.
• Enhance error messages with recovery hints. When entity validation fails, return: 'Entity "light.xyz" not found. Call list_entities(domain="light") to see available lights.' This guides LLM self-correction.
• Document pagination for list_entities. Add parameters: limit (default 50, max 500), offset (default 0). Return total_count and has_more in response. Mention in description: 'Results are paginated; use limit and offset for large entity lists.'
• Clarify send_command constraints. Add description: 'Valid domains: light, climate, switch, media_player, etc. Service names vary by domain (e.g., light.turn_on, climate.set_temperature). Consult Home Assistant service documentation for valid service_data parameters.'